If you are running single ended, the tubes labelled 1,2,4,5 will have the greatest impact on sound as they are used in the gain stage. If you are running balanced, tubes 3 and 6 are used as buffers and also provide gain to the balanced section, therefore, don’t skimp on these tubes if running balanced.
Tubes 7 and 8 are used for the headphone. If you don’t use headphone, this is a good place to insert the Electro-Harmonix tubes.
Don't forget to upgrade the terrible JJ 5AR4 rectifier tube in the power supply.
Tubes 7 and 8 are used for the headphone. If you don’t use headphone, this is a good place to insert the Electro-Harmonix tubes.
Don't forget to upgrade the terrible JJ 5AR4 rectifier tube in the power supply.